Now showing items 1-20 of 32

    • Inorganic, organic, and perovskite halides with nanotechnology for high–light yield x- and γ-ray scintillators 

      Maddalena, Francesco; Tjahjana, Liliana; Xie, Aozhen; Arramel; Zeng, Shuwen; Wang, Hong; Coquet, Philippe; Drozdowski, Winicjusz; Dujardin, Christophe; Dang, Cuong; Muhammad Danang Birowosuto (2019)
      Trends in scintillators that are used in many applications, such as medical imaging, security, oil-logging, high energy physics and non-destructive inspections are reviewed. First, we address traditional inorganic and ...
    • Polarization-resolved plasmon-modulated emissions of quantum dots coupled to aluminum dimers with sub-20 nm gaps 

      Tobing, Landobasa Yosef Mario; Zhang, Dao Hua; Fong, Kah Ee; Muhammad Danang Birowosuto; Gao, Yuan; Dang, Cuong; Demir, Hilmi Volkan (2018)
      An aluminum dimer nanoantenna with nanogaps is an ideal platform for enhancing light–matter interaction at the nanoscale for the UV–vis spectrum, but its realization has been hindered by the surface oxidation of aluminum ...
    • Morphology controlled lithium storage in Li3VO4 anodes 

      Yang, Guang; Zhang, Bowei; Feng, Jianyong; Lu, Yu; Wang, Zhiqiang; Aravindan, Vanchiappan; Aravind, Muthiah; Liu, Jilei; Srinivasan, Madhavi; Shen, Zexiang; Huang, Yizhong (2018)
      Li3VO4 (LVO) anode materials with controllable morphologies ranging from spherical-assemblies, single-crystal nanorods, and flower shapes to bulk-shapes were fabricated via a solvothermal approach using different alcohols ...
    • Crown Ethers Enable Room Temperature Synthesized CsPbBr3 Quantum Dots for Light-Emitting Diodes 

      Veldhuis, Sjoerd Antonius; Ng, Yan Fong; Ahmad, Riyas; Bruno, Annalisa; Jamaludin, Nur Fadilah; Damodaran, Bahulayan; Mathews, Nripan; Mhaisalkar, Subodh Gautam (2018)
      The synthesis of all-inorganic cesium lead halide perovskite quantum dots (QDs) typically requires high temperatures, stringent conditions, large quantities of surface ligands, and judicious purification steps to overcome ...
    • Precursor Non-stoichiometry to Enable Improved CH3NH3PbBr3 Nanocrystal LED Performance 

      Chandran, Bevita K; Veldhuis, Sjoerd Antonius; Chin, Xin Yu; Bruno, Annalisa; Yantara, Natalia; Chen, Xiaodong; Mhaisalkar, Subodh (2018)
      High photoluminescence quantum yields and narrow emission wavelengths, combined with low temperature solution processing, make CH3NH3PbBr3 nanocrystals (NCs) favorable candidates for light-emitting applications. Herein, ...
    • Energy Transfer Efficiency from ZnO-Nanocrystals to Eu3+ Ions Embedded in SiO2 Film for Emission at 614 nm 

      Mangalam, Vivek; Pita, Kantisara (2017)
      In this work, we study the energy transfer mechanism from ZnO nanocrystals (ZnO-nc) to Eu3+ ions by fabricating thin-film samples of ZnO-nc and Eu3+ ions embedded in a SiO2 matrix using the low-cost sol-gel technique. The ...
    • Optical fiber magnetic field sensor based on magnetic fluid and microfiber mode interferometer 

      Zheng, Yangzi; Dong, Xinyong; Chan, Chi Chiu; Shum, Perry Ping; Su, Haibin (2014)
      A magnetic field sensor is proposed based on the combination of magnetic fluid (MF) and an optical microfiber mode interferometer (MMI). It is measured that the MMI is highly sensitive to ambient refractive index (RI) with ...
    • Synthesis and assessment of new cyclopenta-2,4-dienone derivatives for energy storage applications 

      Lim, Zheng Bang; Tan, Kim Seng; Lunchev, Andrey V.; Li, Hairong; Cho, Sung Ju; Grimsdale, Andrew Clive; Yazami, Rachid (2015)
      A series of tetraphenylcyclopenta-2,4-dienones with various substituents including hydrogen, thiophene and methoxy groups were prepared to compare their suitability as materials for forming alkali metal- based (Li or Na) ...
    • Review of diverse optical fibers used in biomedical research and clinical practice 

      Keiser, Gerd; Xiong, Fei; Cui, Ying; Shum, Perry Ping (2014)
      Optical fiber technology has significantly bolstered the growth of photonics applications in basic life sciences research and in biomedical diagnosis, therapy, monitoring, and surgery. The unique operational characteristics ...
    • Effect of OFF-state stress induced electric field on trapping in AlGaN/GaN high electron mobility transistors on Si (111) 

      Anand, M. J.; Ng, G. I.; Arulkumaran, S.; Manoj Kumar, C. M.; Ranjan, K.; Vicknesh, S.; Foo, S. C.; Syamal, B.; Zhou, X. (2015)
      The influence of electric field (EF) on the dynamic ON-resistance (dyn-R DS[ON]) and threshold-voltage shift (ΔVth) of AlGaN/GaN high electron mobility transistors on Si has been investigated using pulsed current-voltage ...
    • Defect-band mediated ferromagnetism in Gd-doped ZnO thin films 

      Venkatesh, S.; Franklin, J. B.; Ryan, M. P.; Lee, J.-S.; Ohldag, Hendrik; McLachlan, M. A.; Alford, N. M.; Roqan, I. S. (2015)
      Gd-doped ZnO thin films prepared by pulsed laser deposition with Gd concentrations varying from 0.02–0.45 atomic percent (at. %) showed deposition oxygen pressure controlled ferromagnetism. Thin films prepared with Gd ...
    • Reduction of current collapse in AlGaN/GaN MISHEMT with bilayer SiN/Al2O3 dielectric gate stack 

      Anand, M. J.; Ng, G. I.; Vicknesh, S.; Arulkumaran, Subramaniam; Ranjan, K. (2013)
      We have studied the drain current dispersion characteristics of conventional AlGaN/GaN HEMTs and SiN/Al2O3/AlGaN/GaN metal-insulator-semiconductor high electron mobility transistors (MISHEMT) fabricated on silicon substrate. ...
    • Future mobility survey 

      Cottrill, Caitlin D.; Pereira, Francisco Câmara; Zhao, Fang; Dias, Iněs Ferreira; Lim, Hock Beng; Ben-Akiva, Moshe E.; Zegras, P. Christopher (2013)
      The Future Mobility Survey (FMS) is a smartphone-based prompted-recall travel survey that aims to support data collection initiatives for transport-modeling purposes. This paper details the considerations that have gone ...
    • A polyoxovanadate as an advanced electrode material for supercapacitors 

      Chen, Han-Yi; Wee, Grace; Al-Oweini, Rami; Friedl, Jochen; Tan, Kim Soon; Wang, Yuxi; Wong, Chui Ling; Kortz, Ulrich; Stimming, Ulrich; Srinivasan, Madhavi (2014)
      Polyoxovanadate Na6V10O28 is investigated for the first time as electrode material for supercapacitors (SCs). The electrochemical properties of Na6V10O28 electrodes are studied in Li+-containing organic electrolyte (1 m ...
    • Photoactive nanocrystals by low-temperature welding of copper sulfide nanoparticles and indium sulfide nanosheets 

      Lim, Hui Min; Tan, Jia Yi; Batabyal, Sudip Kumar; Magdassi, Shlomo; Mhaisalkar, Subodh Gautam; Wong, Lydia H. (2014)
      We successfully utilize the concept of coalescence and room-temperature sintering to prepare morphologically different nanoparticles. n-Type chalcogenide (CuIn5S8) nanocrystals are synthesized at room temperature by simple ...
    • Direct measurement of coherent phonon dynamics in solution-processed stibnite thin films 

      Chong, Wee Kiang; Xing, Guichuan; Liu, Yun; Gui, Ee Ling; Zhang, Qing; Xiong, Qihua; Mathews, Nripan; Gan, Chee Kwan; Sum, Tze Chien (2014)
      We report observations of coherent phonon oscillations in solution-processed polycrystalline stibnite (Sb2S3) photovoltaic thin films using transient absorption spectroscopy. Detailed optical spectroscopy correlated by ...
    • Control and design of fiber birefringence characteristics based on selective-filled hybrid photonic crystal fibers 

      Han, Tingting; Liu, Yan-ge; Wang, Zhi; Guo, Junqi; Wu, Zhifang; Luo, Mingming; Li, Shuo; Wang, Jing; Wang, Wei (2014)
      We demonstrated a kind of birefringence-controllable hybrid photonic crystal fibers (HPCFs) by selectively infiltrating air holes of PCFs with index-tunable liquids processing higher index than silica background. Detailed ...
    • Preparation of biofunctionalized quantum dots using microfluidic chips for bioimaging 

      Hu, Siyi; Zeng, Shuwen; Zhang, Butian; Yang, Chengbin; Song, Peiyi; Tng, Danny Jian Hang; Lin, Guimiao; Wang, Yucheng; Anderson, Tommy; Coquet, Philippe; Liu, Liwei; Zhang, Xihe; Yong, Ken-Tye (2014)
      Biofunctionalized quantum dots (QDs), especially protein-coated QDs, are known as useful targeted fluorescent labels for cellular and deep-tissue imaging. These nanoparticles can also serve as efficient energy donors in ...
    • Power-referenced refractometer based on hybrid fiber grating 

      Dong, Xinyong; Zheng, Jie; Shum, Perry Ping (2013)
      A power-referenced fiber refractometer based on a hybrid fiber grating formed by a tilted-fiber Bragg grating (TFBG) cascading by a chirped-fiber Bragg grating (CFBG) is proposed and experimentally demonstrated. The optical ...
    • Tunable single-mode slot waveguide quantum cascade lasers 

      Meng, Bo; Tao, Jin; Li, Xiao Hui; Zeng, Yong Quan; Wu, Sheng; Wang, Qi Jie (2014)
      We report experimental demonstration of tunable, monolithic, single-mode quantum cascade lasers (QCLs) at ∼10 μm with a two-section etched slot structure. A single-mode tuning range of 77 cm−1 (785 nm), corresponding to ...